What describes the practice of products and services traded among countries around the world?
Global economy describes the practice of products and services traded between countries around the world. This answer has been confirmed as correct and helpful.
What is the best way to define work quizlet?
Define work. The result of using force to move an object over a distance.
What determines if work is positive or negative?
Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.
What conditions must be satisfied if work is to be done?
1. For work to be done , the force must be applied and must not be zero. 2. work is done when the object moves through a certain distance in a particular direction after the force had been applied on it.
In which case is positive work done?
Positive work follows when the force has a component parallel to the displacement. Positive work adds energy to a system. Negative work follows when the force has a component opposite or against the displacement.
Under what conditions work done is zero?
Zero work is done when the displacement of a body is zero or perpendicular (θ=900,cosθ=0) to the direction of force applied, then work done is zero. For example, if a person tries to push a wall, he is applying force yet the wall does not move, so the displacement of the wall is zero, and hence work done is zero.
What are three conditions when work done is said to be zero?
When force and displacement are perpendicular to each other, or when force or displacement is zero. Example: When we hold an object and walk, the force acts in a downward direction whereas displacement acts in the forward direction.
Under what condition the work done by a force is zero * 1 point?
The work is stated as zero when there is no displacement of any given object along a line of force.
What is an example of zero work?
1) A simple example of zero work is when you stand holding a bag in your hands and do not move it. Your hands apply a force on the bag to balance the force of gravity exerted on it but since there is no displacement of the bag, the work done on it by you (your force) and also the gravity is zero.
Which of the following is the best example of work being done * 1 point?
Answer. Answer: Doing homework and lifting boxes.
What are the 3 types of work?
There are three kinds of work you do a regular basis.
- First, there’s work that gets immediate results.
- Second, there’s work that should be done by someone else.
- Third, there’s the work that contributes to long-term growth.
Why is work done negative?
Many of us know, an object released from certain height attains some kinetic energy due to positive work done by the force of gravity. On the flip side, negative work done can be understood as the reduction in kinetic energy of the body. Hence, the work done by frictional force is negative.
Can kinetic energy of a body be negative?
Common mistakes and misconceptions. Kinetic energy can’t be negative, although the change in kinetic energy Δ K \Delta K ΔK can be negative. Because mass can’t be negative and the square of speed gives a non-negative number, kinetic energy can’t be negative.
Why is kinetic energy of a body never negative?
The kinetic energy of a body cannot be negative because the mass cannot be negative and the square of the speed gives a non-negative number.
Why kinetic energy is proportional to the square of velocity?
The kinetic energy of a moving object is directly proportional to its mass and directly proportional to the square of its velocity. This means that an object with twice the mass and equal speed will have twice the kinetic energy while an object with equal mass and twice the speed will have quadruple the kinetic energy.
What is the meaning of negative potential?
: an electric potential lower than that of the earth or other conductor taken as an arbitrary zero of potential.
What is the zero level of potential energy?
Zero potential energy means the point at which the perfectly rigid body has zero internal energy. Perfectly rigid bodies usually gain or loose internal energy (internet energy is a term kept vague here) as they enter electromagnetic(if charged) and gravitational(if of mass) fields.
Where is the zero point of a potential energy?
infinity
Why is kinetic energy not a vector?
Kinetic energy is a scalar because it is defined to be a scalar. The quantity , a scalar, is useful, so it gets a name: kinetic energy. The quantity , which is a vector whose magnitude is the kinetic energy and whose direction is the direction of motion, is not useful, so it doesn’t have a name.